Pivotable shelf



FIG. 1 is a perspective view of the pivotable shelf;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is an opposite side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in FIGS. 1 and 7 are for the purposes of illustrating the environment of the article only and form no part of the claimed design. 

CLAIM The ornamental design for a pivotable shelf, as shown and described. 